A bag-making and packaging machine includes a forming mechanism, a vertical sealing mechanism, a transverse sealing mechanism and a receiving member. The forming mechanism is configured to roll a sheet-shaped packaging material into a cylindrical shape to form a cylindrical packaging material. The vertical sealing mechanism is configured and arranged to seal an overlapping portion of the cylindrical packaging material with heat vertically along a direction in which the cylindrical packaging material extends. The receiving member is attached to the forming mechanism in a position facing the vertical sealing mechanism, and configured and arranged to sandwich the overlapping portion together with the vertical sealing mechanism. The receiving member has elasticity with which the receiving member presses the overlapping portion toward the vertical sealing mechanism.